Selvage looping device for loom



Dec. 3, 1968 H. WHITE:

SELVAGE LOOPING DEVCE FOR LOOM Filed Feb. 23, 1967 2 Sheets-Sheet l HAROLD WHITE ATTORNEY Dec. 3, 1968 H, wHlTE 3,413,9 99

SELVAGE LOOPING DEVICE FOR LOOM Filed Feb. 23, 1967 ZSheets-Sheet 2 INVENTOR. HeRaLo wmTa United States Patent O" 3,413,999 SELVAGE LOOPING DEVICE FOR LOOM Harold White, Cumberland, RJ., assignor, by mesne assignments, to John Donald Marshall and Horace L.

Bomar as trustees under an agreement and indeuture of trust Filed Feb. 23, 1967, Ser. No. 618,100 7 Claims. (Cl. 139-195) ABSTRACT OF THE DISCLOSURE Background of the invention .(1) The instant invention provides improvement in means for holding to full width each loop of filling yarn which eonnects two consecutive picks. A rigid member is moved adjacent to or just inwardly of the selvage threads to retain the loop as the pick is inserted and thus relieve the selv'age threads from the tension exerted by the ingoing filling yarn. The rigid member is removed from its position just prior to beat-up by smooth-acting, positive linkage.

(2) Numerous devices are found in the art for holding a loop of filling at the selvage until the reed nears the beat-up point. These have generally been urged into the holding position by the force of gravity or by such biasing members as tension or compression springs. Removal of the device from the holding position has been accomplished by causing it to be struck by either the lay or some other part carried by the lay and moved out of range of the fast-approaching reed. The abrupt actu'ation of these devices has introduced excessive wear and damaged parts by overcoming inertia and through rebounding. Examples of selvage devices which are yactuated in this manner are disclosed in U.S. Patents 2,254,869 and 2,841,185.

Summary The instant invention is directed toward overcoming the disadvantages stated above by providing positively controlled motion to a selvage needle so as not to be adversely aifected by increases in loom speed. In high-speed looms, especially those of the shuttleless type, where picks of filling may be inserted in excess of four times per second, there is insufficent time for an uncontrolled selvage needle to perform uniformly. Where the action is initiated from bumping by the lay beam, the uncert'ainty of vibration and overthrow of the parts, as well as the lower reaction of spring induced movement, have made this type of device unreliable. In the embodiment herein the reciprocal motion of the sword actuates positive linkage in a manner to pivot the selvage needle into and out of the holding position in timed relationship with the moving reed. The straight-line motion from the sword is translated to a crank-arm action so that the stroke accelerates as the sword approaches front center. This permits `a relatively slow pivot-al motion for the selvage needle and a quickening as the reed nears the beat-up point.

It is, therefore, a general object of the invention to provide activating linkagewfor a selvage needle which shall be positive in action at all usual loom speeds.

It is another object ofthe invention to provide means to pivot a selvage needle out of its holding position in a smooth accelerating stroke rather than by a violent striking action.

These and other objects of the invention will become apparent as further details are disclosed.

3,413,999 Patented Dec. 3, 1968 Brie description of the drawings The invention will be described in greater detail by rerefence to a specific embodiment thereof as shown in the accompanying figures of drawing, wherein:

FIG. 1 is an elevation of the invention in Operating position upon a loom; and

FIG. 2 is an exploded view of the parts in FIG. 1.

Description of the preerred embodiment Now referring to FIG. 1, fragmentary portions of a loom are shown to point out the location of the invention. A sword 20 is fixed for reciprocation Within the loom in a known manner and carries at its upper end 21 a lay beam 22 with a racew'ay 23 and a reed 24 fastened thereto. A loomside 25 supports a filling motion case 26 and a loom temple 27 is fastened to a fixed bracket 28. The parts thus far described are those for a shuttleless type loom; however, the invention is applioable to a fly-shuttle loom aS well. Warp threads 29 are adapted to be opened as Warp sheds to receive individual picks of filling 30 in forming fabric.

A bracket 31 is secured by screws 32 to a stationary part of the loom such as the case 26 in a location forwardly of the temple 27. A bearing 33 is supported horizontally by the bracket 31 in a hole 34 with a nut 35. A support member 36 having an actuating arm 37 is pivotally held by the bearing 33. A rod 38, extending toward the center of the loom, is firmly fixed into the member 36 to be pivoted therewith. A collar 39 is adjustably fastened along the rod 38 in any desired position with a rearwardly directed rod 40 adjustably fastened into the collar 39. Fastened to the end of rod 40 is a downwardly extending pointed needle 41 which is sufiiciently stiff to restrain each loop of filling around it as'the pick is inserted. The needle 41 is pivoted through a Vertical plane from an inactive position (FIG. 1) out of the way of the forwardly moving reed 24 downwardly to a loop-holding position as shown in solid line drawin-g.

In placing the needle into a loop-holding position, the point of the needle is below the level of the ingoing pick of filling and may be inserted betwen the threads near the edge of the selvage or it may be outside of the selvage to form the loop beyond the full width of the Warp threads. The lateral position is readily adjustable along the rod 38. The purpose of the needle is primarily that of reinforcing the outer selvage threads momentarily as the filling is inserted and the tension at the loop increased.

A rigid connecting rod 42 is flexibly fastened to the arm 37 and extends downwardly along the loopside 25. A bracket 43 is fastened to the loomside 25 by screws 44 to provide a fiXed pivot point as at the screw 45. a crank lever 46 is fixed to the pivot point 45 on a bearing 47 and has an arm 48 by which the lever may be pivoted. A ball-type type rod end 49 is tightened to the lower end of the rod 42 and is flexibly fastened to the arm 48.

A bracket 50 is fixed to the sword 20 by screws 51 and has one end of a lengthwise adjustable link 52 fastened theireto. The other end of the link 52 is fastened to the distal end 53 of the crank lever 46 which will be pivoted by the reciprocal motion of the sword 20. The lever arm 48 is positioned to be nearly Vertical when the sword 20 is at the back-center point of its travel and will pivot to a forwardly tilted condition as the sword reaches front center. It will be remembered that, as the sword approaches front center, the reed 24 will be making a beat-up of the .pick of filling. It is essential that the needle 41 be moved out of the selv'age prior to beat-up, but it is desirable that this -movement of the needle be delayed as long as possible.

Motion is transmitted to the selvage needle 41 by the `Vertical movement of the rod 42. When the rod is raised,

the needle Will move to the loop-holding position and as the rod is lowered, the needle will become inactive. In pivoting the lever arm 48 from nearly Vertical, the rate of descent for the'rod' 42 commences rel'atively slowly and accelerates as the arm pivots toward the lower end of itS arc. This permits the delayed action in removing the needle from the loop-holding position.

The instant invention overcomes the disadvantage of the previously known deviceswith a positively driven linkage whereby the selvrage looping needle is withdrawn from action in a stroke having smooth acceleration and deceleration.

- While one embodiment of the invention has been disclosed, it is to be understood that the inventive concept may be carried out in a number of ways. This invention is, therefore, not to be limited to the precise details disclosed, but is intended to embrace all variations and modifications thereo'f falling within the spirit of the invention and the scope of the claims.

I claim:

1. In a loom having a sword, and Warp and filling threads for weaving, a selvage looping device which comprises:

(a) 1a selvage needle for retaining loops of filling,

(b) pivotal support means upon lthe loom for c-arrying said needle between a loop-holding position and an inactive position,

(c) a crank lever vertically spaced from said support lmeans and supported by the 100m for pivotal movement thereon,

(d) rigid means connecting said support means and said crank lever for transmitting movement therebetween, and

(e) positive linkage means between said sword and said crank lever for providing pivotal motion to said crank lever by the reciprocating action of said sword.

2. The mechanism as defined in claim 1 wherein said support means includes a laterally adjustable member for 4. The mechanism as defined in clairn 3 wherein said cr-ank lever is supported at a fixed point upon the loom and pivots through an arc from a generally upright condition to a forwardly tilted condition, said crank lever reaching the upright condition as said sword arrives at back-center of its travel and reaching the forwardly tilted condition as said sword arrives at front-center of its travel.

5. The mechanism as defined in claim 4 wherein said selvage needle is lowered to and lifted from its loop-holding position through the generally vertcal motion provided to the said rigid means by said crank lever being pivoted through said arc.

6. The mechanism 'as defined in claim 5 wherein said needle is adapted to lassume its loop-holding position when said rigid means is raised and is -adapted to assume its inactive position when said rigid means is lowered, and wherein the rate of travel is adapted to accelerate as said rigid means is lowered.

7. The mechanism as defined in claim 6 wherein said positive linkage means is longitudinally adjustable.

References Cited UNITED STATES PATENTS 3,145,739 8/1964 Metzler 139-370 FOREIGN PATENTS 843,602 3/1939 France. 553,260 6/1932 Germany. 896,519 5/ 1962 Great Britain.

HENRY S. JAUDON, Primary Examiner. 

